After a period of around 60 days my PC cannot access any MSnetwork (Win2k server and other 9x workgrouped PC resources after a reboot. (Can still see netware servers). Can still access Intranet resources eg. IIS and external internet resources through DUN. One possible clue could be when trying to access a dial up connection the win2k logon screen appears and needs to be cancelled, although I suspect this is due to log on to network is specified in DU connection. Furthermore all other PCs can see the one with the fault. If you try to log in to the server you get an authentication error logging in with correct username. If you log in with an incorrect username you get an invalid user message.